Measurement of the production of charm jets tagged with D0 mesons in pp collisions at √s = 7 TeV

Abstract

The production of charm jets in proton-proton collisions at a center-of-mass energy of √ s = 7 TeV was measured with the ALICE detector at the CERN Large Hadron Collider. The measurement is based on a data sample corresponding to a total integrated luminosity of 6.23 nb−1 , collected using a minimum-bias trigger. Charm jets are identified by the presence of a D0 meson among their constituents. The D0 mesons are reconstructed from their hadronic decay D0 →K−π +. The D0 -meson tagged jets are reconstructed using tracks of charged particles (track-based jets) with the anti-kT algorithm in the jet transverse momentum range 5 < pch T,jet < 30 GeV/c and pseudorapidity |ηjet| < 0.5. The fraction of charged jets containing a D0 -meson increases with p ch T,jet from 0.042 ± 0.004 (stat) ± 0.006 (syst) to 0.080 ± 0.009 (stat) ± 0.008 (syst). The distribution of D0 -meson tagged jets as a function of the jet momentum fraction carried by the D0 meson in the direction of the jet axis (z ch || ) is reported for two ranges of jet transverse momenta, 5 < pch T,jet < 15 GeV/c and 15 < pch T,jet < 30 GeV/c in the intervals 0.2 < zch || < 1.0 and 0.4 < zch || < 1.0, respectively. The data are compared with results from Monte Carlo event generators (PYTHIA 6, PYTHIA 8 and Herwig 7) and with a Next-to-Leading-Order perturbative Quantum Chromodynamics calculation, obtained with the POWHEG method and interfaced with PYTHIA 6 for the generation of the parton shower, fragmentation, hadronisation and underlying event.